bug#63072: 28.2; CC Mode: Fix "bsd" style and add "freebsd" and "openbsd" ones

[Olivier Certner]

Hi,

I noticed that the current "bsd" CC mode style is not compliant with what all 
BSDs have been doing since their inception. This is the first patch.

Also, FreeBSD and OpenBSD have been having more stringent requirements (as 
documented in their style(9) manpage; for more than 20 years). So the second 
patch creates specific "freebsd" and "openbsd" styles deriving from "bsd" and 
adding just the two additional requirements.

Patches to be attached after the bug report is created and assigned an ID.

Regards.

-- 
Olivier Certner